Drive-well point



H. R. MARK DRIVE WELL POINT d an.

Patented Jan. 12, 1926.-

UNITED STATES HARRY R. MARK, OF CHICAGO. ILLINOIS, ASSIGNOR TO CLAYTON MARK 8c COMPANY,

PATENT oFFicE.

OF CHICAGO, ILLINOIS. A CORPORATION OF ILLINOIS.

DRIVE-WELL POINT.

Application filed October 23, 1924. Sen'al No. 745,307.

To all whom it may conccim:

Be it known that I. HARRY R. MARK, a citizen of the United States, residing at Chicago. in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drive-Well Points, of which the following is a specification.

My invention relates to a novel construction of a drive well point.

Heretofore some difficulty has been experienced with the stripping of the jackets and gauze of drive well points, particularly when the points were of long length and when driving through closely packed soil.

In the ordinary drive well point. the outer jacket consists of a foraminated sleeve split longitudinally and slipped into position over the inner fine mesh screen. The edges of this jacket are brought together and secured in place by a seam or line of solder, which joins these edges and penetrates into the inner interstices of the screen. However, experience has proven that this construction, under some conditions, is not effective. During severe driving or where driving is done through closely packed soil, that part of the brass jacket or sleeve opposite the soldered seam not being united to the inner screen, because of friction, gathers into wrinkles and strips opposite the soldered seam.

In an attempt to overcome this tendency to strip, points are sometimes spotted with solder in a line on the jacket opposite the soldered seam, but this is of very little corrective value, as the solder does not penetrate sufficiently through the small openings of the brass jacket to have the jacket and the inner mesh screen adhere firmly to the tube.

The objects of my invention are to provide a practically non-stripable jacket construction for the drive well point, so that, irrespective of the nature of the soil, the jacket and fine mesh screen will constantly hug the inner tube; another object resides in providing a novel arrangement of seams for securing the edges of the jackets and of the screen together and to the inner foraminated metal tube. These and other objects of the invention will be apparent from a perusal of the following specification when taken in connection with the accompanying drawings wherein Figure 1 is a side elevation of my new drive well point construction, with certain portions broken away to show the inner construction.

Figure 2 is an enlarged sectional view of the lower end of the device.

Figure 3 is a section taken horizontally through Figure 2.

. Figure 4 is a perspective view of the screen and jacket sections.

Figure 5 is an enlarged detail view of tho soldered seam.

Referring now to the drawings in detail, my drive well point comprises the usual metallic inner tube 1 having the relatively large openings 2 for the flow of water therethrough. The lower end 3 of tube 1 abuts firmly against a shoulder formed on the head of the point 4 proper and is united thereto by means of the usual pin 5. The opposite end 6 is provided with the usual threads for connection with the driving sections which couple to the pump for withdrawing the water from the ground, as well known in the art.

The holes 2 of inner tube 1 are adapted to be covered by a screen of very fine mesh to exclude sand or other sediment and prevent it being drawn into the tube 1 along with the water. In the present invention this fine mesh screen is formed in preferably two arcuate sections 7 and 8, each section extending the desired length of the tube so as to cover all the holes 2 therein, each section being approximately heini-spherical, so that when the edges are juxta-positioned on the inner tube 1, the two sections will envelop the inner tube and the edges will either meet or substantially meet. Preferably they are slightly spaced apart.

The screen sections are provided with a protective casing consisting referably of the usual brass, foraminated sleeve, the foraminations being much smaller than the holes 2 of tube 1, but sufliciently lar e to permit the passage of the requislte vo ume of water. The object of this sleeve is to protect the screen and prevent its being stripped or punctured. Inthe present invention instead of making this sleeve as a. single and lower split sleeve, it is preferably made of two sections 9 and 10, substantially corresponding in size and shape to the screen sections. The perforations are disclosed at 11. Thus when these two complementary sleeve sections are positioned over the screen sections 7 and 8 on the inner foraminated tube 1, the edges of the screen sections and sleeve sections will substantially register, as shown in detail in Figure 5. Preferably the edges of these sleeves 9 and 19 are slightly spaced apart at diametrically opposite points of the inner tube 1 and longitudinally thereof. By means of this arrangement, when the molten solder is poured into these substantially registering and spaced screen and sleeve edges, the solder 12 will penetrate between the screen edges over and under the same, so as to flow into contact with the outer wall of the inner tube 1 and the inner wall of the outer sleeve sections 9and 10. At the same time the solder will flow between the slightly spaced apart edges of the outer sleeve sections 9 and 10 and will flow over these edges and into the perforations 11 of the outer slee e sections to form a substantially Wide band or seam of,solder. This solder is intimately bound to these inner edges of the screen and sleeve sections and also the exterior wall of the inner tube 1. Furthermore, this binding seam will occur at diametrically opposite points on the periphery of the tube so that the outer protective sleeve is snugly held to the-screen all around the circumference and longitudinally of the drive well point. The upper edges of the outer sleeve sections are soldered as desired at the upper and lower edges 13-and 14.

From the foregoing description and especially from an inspection of Figure 5 of the drawings, it will be evident that I have provided a very durable double seam for the i'acket; a seam wherein the solder is so firm y interlocked with the edges of the screen sections and the outer sleeve sections as to practically reclude its working loose, especially since t e solder is also bound to the outer face of the inner tube 1, the inner face of the edges of the outer sleeve sections and to the outer foraminatcd faces of the outer sleeve edges;

It must be manifest that other construe 'tions of this inventionwill occur to those skilled in the art and it is not my intention to limit this invention to the exact details disclosed the accompanying drawings foraminations, protective foraminated sleeve sections enveloping said screen sections, said screen sections and sleeve sections having substantially registering edges and a filling of solder lying in and covering the free edges of said screen and sleeve sections and firmly uniting the same together and to said inner tube.

2. A drive well point comprising a foraminated inner metallic tube having a driving point, a fine mesh screen completely enveloping said inner tube-and covering said foraminations, said screen-being composed of sections having their edges extending substantially parallel to the longitudinal axis of the inner tube, and an outer protective foraminated sleeve enveloping said screen, consisting of sections having their free edges substantially registering with the free edges of the screen sections, said free edges of the protective sleeve and screen sections being firmly united together and to the inner tube by a filling of solder disposed in the spaces formed at the adjacent edges of said screen sections and protective sleeve;

3. A drive well point comprising a foraminated inner tube having a drivln point, arcuate screen sections of fine mesh disposed on said tube so, as to cover the foraminations, the free edges of said sections extending substantially longitudinally of said tube and disposed in substantially diametrically opposed relation thereon, foraminated sleeve HARRY R. MARK. 

